Longmont Property Tax Quick Facts
- Location
- Longmont, Colorado
- Boulder County
- Assessed By
- the Boulder County assessor
How to Protest Property Taxes in Longmont
Check your assessment
Enter your Longmont address for a free 60-second check. We compare your assessed value against comparable sales and neighborhood data.
Get your evidence packet
If over-assessed, pay $45 for a complete protest packet with comparable sales, equity analysis, and pre-filled forms for Boulder County.
File your protest
Submit your protest to Boulder County. Our filing guide walks you through every step.
About the Longmont Property Market
Longmont is a city located in Boulder County, Colorado. Every property inside the Longmont city limits is assessed by the Boulder County assessor, which applies Colorado property tax rules uniformly across the county.
Because Longmont property values are set at the county level, the same assessment rules apply to homes throughout the city. Homeowners who believe their Longmont home is over-assessed have the right to file a protest directly with Boulder County.
Under Colorado law, a protest cannot increase your assessed value — it can only stay the same or go down. That makes a Longmont protest a low-risk way to push back against an over-assessment, especially for homeowners with strong comparable sales evidence.
Longmont Property Market Context
The property tax picture in Longmont is shaped as much by Colorado statewide policy as by anything unique to a city.
Colorado market character
Colorado values are reassessed on a two-year cycle, and recent cycles have produced double-digit increases along the Front Range and mountain resort communities. The residential assessment rate sits around 6.7% after recent legislation, but on fast-appreciating homes the bill still jumps sharply.
How Colorado handles protests
Colorado is protest-friendly. Assessed value cannot increase as a result of a protest, and the state runs a clear three-step appeal path: assessor, County Board of Equalization, then Board of Assessment Appeals.
When to file in Longmont
Notices mail May 1. Protest window closes June 8 at the assessor level. This is one of the tightest deadlines in the country — do not wait.
Common Longmont Property Types
Longmont homeowners typically file protests across these property categories:
Single-family homes
The most common residential type and the dominant protest category.
Condominiums
Common in denser parts of the city and near employment centers.
Townhouses
Attached-home neighborhoods in newer subdivisions.
Small multi-family
Duplexes and 2-4 unit buildings assessed as income property.
Commercial
Retail, office, and small commercial along major corridors.
ProtestMax supports all of the above property types in Longmont. Each protestpacket is tailored to the property's classification and uses comparable sales from Longmont and surrounding Boulder County neighborhoods.
Longmont Property Tax Protest Questions
How do I protest my property tax in Longmont, Colorado?
What is the property tax rate in Longmont?
When is the protest deadline for Longmont property taxes?
How much can I save on property taxes in Longmont?
Can my Longmont property tax increase from filing a protest?
Nearby Cities in Boulder County
These Colorado cities share the same protest deadline and are assessed by the Boulder County assessor.